Abstract. Sudiana A, Putri A, Napitupulu TP, Purnaningsih I, Idris, Kanti A. 2020. Growth inhibition of Fusarium solani and F. oxysporum by Streptomyces sasae TG01, and its ability to solubilize insoluble phosphate. Biodiversitas 21: 429-435. Actinomycetes have been widely explored for new antibiotic production, but not many studies explore its abilities to inhibit the growth of phytopathogenic fungi and solubilize insoluble phosphate hence stimulate the growth of plants. We isolated Actinomycetes from the soil. Based on morphology, physiology, and 16S rDNA analyses, the isolate is closely related to Streptomyces sasae. The strain was able to inhibit the growth of phytopathogenic fungi Fusarium solani, and Fusarium oxysporum. S. sasae produced secondary metabolites 2-methyl-1,3-dioxolane as the major constituent. The strain assimilated variable carbon sources include L-arabinose, D-fructose, D-glucose, D-mannitol, Lactose, raffinose, L-rhamnose, and sucrose. The strain grew at pH 6.0 to 8.0, and at salinity (1-3%). Their growth was affected by the salinity level. The strain solubilized Ca-P at 1-3% salinity, but their ability to solubilize phosphate was influenced by salinity. The strain was also able to solubilize rock phosphate. Their ability to solubilize less soluble phosphate and inhibit the growth of F. solani and F. oxysporum may imply that this strain is potential for biocontrol agents. The 16S rRNA gene was submitted to DDBJ with the entry number 5df623c1a3c8820021322a36.TG01, and the accession number is LC514451.
Several bacteria were isolated from straw mushroom (Volvariella volvacea) cultivation medium. There are three potential isolates previously characterized and has growth inhibition effect against V. volvacea. This screening result lead to the further study about the inhibition activity against phytopathogenic fungi. The aim of this research is to investigate the antifungal activity of three bacterial isolates against three phytopathogenic fungi and identification of the bacteria. The method used in this study are antifungal assay using co-culture method and disk difussion assay using the filtrate of each bacteria. The profile of antifungal compound was identified using ethyl acetate extract followed by evaporation and gas chromatography (GC-MS) analysis. Identification of each isolates was performed using 16S rDNA amplification and sequencing. Three phytopathogenic fungi i.e Cercospora lactucae (InaCC F168), Colletotrichum gloeosporides (InaCC F304) and Fusarium oxysporum f.sp. cubense (F817) were co-cultured with bacterial isolates C2.2, C3.8, and D3.3. The C3.8 isolate has highest average inhibition activity either using isolate and filtrate. The result relatively consistent against three phytopathogenic fungi. The metabolite profile of C3.8 isolate showed the Bis(2-ethylhexyl) phthalate as the main compound with 97% similarity. Bis(2-ethylhexyl) phthalate has potential effect as antibacterial and antifungal compound. According to EzBioCloud and GeneBank databases, the C2.2 isolate identified as Bacillus tequilensis, C3.8 as Bacillus siamensis and D3.3 as Bacillus subtilis subsp. Subtilis. This study also shows the potential of Bacillus siamensis C3.8 as biocontrol against phytopathogenic fungi.
In fermented beverages, yeasts have been exploited for many years and are well-known as alcohol producers. In Indonesian traditional beverages, however, information about microbiology and potential bioactive-compounds of rice wine produced by the local people, especially in Lombok, are limited. The present study described the compounds of traditional rice wine including yeast species and its produced compounds that have biological activity. The yeast in rice wine was isolated using three growth agar media by serial dilution, selected the yeast colonies for molecular identification, and performed gas chromatography tandem with mass spectrometry for profiling the chemical compounds of the rice wine. The result indicated that the rice wine sold without distillation still contained Saccharomyces cerevisiae as the main alcohol producer. Meanwhile, at least six bioactive-compounds such as l-(+)-Ascorbic acid 2,6-dihexadecanoate, performic acid, octadecanoic acid, sulfurous acid, tetratriacontane, and eicosane were detected and reportedly related to antimicrobial, antiviral, anticancer, and other pharmacological activities. These findings could be the first step of studies on exploring Indonesian’s local rice wine as alcohol and bioactive-compound sources for health benefits.
In order to investigate the feasibility of low-cost media for producing well- characterized single-cell carotenoid, the study on biosynthesis and profiling carotenoid in the yeast of Phaf ia rhodozyma was carried out. We have successfully identified the profiles of single-cell carotenoids of P. rhodozyma, which was cultivated in glucose-based medium (MG), molasses-based medium (MM), and coconut water-based medium (MC). Cells were separately cultured in those media under aerobic batch culture system to obtain the carotenoid profiles based on high performance liquid chromatography (HPLC) analysis. The results showed that medium composition strongly affects the profiles of P. rhodozyma carotenoids represented by ratio of astaxanthin and beta-carotene (ratio A/B). Astaxanthin was highly synthesized in cells cultivated in MG with ratio A/B as much of 20:1. On the other hand, MM and MC produced a lower ratio A/B than MG as much of 0.4:1 and 0.2:1, respectively. In addition, carotenoids profiles were detected more diverse when this yeast species was cultivated in two waste-based media. This study provided a basic physiological knowledge of P. rhodozyma cells for carotenoid biosynthesis using potential low cost cultivation m
The aim of the study was to determine the production of citric acid in liquid and solid media made from the juice and bagasse of sorghum plant. Sorghum has a great potential to be utilized as fermentation substrate for production of citric acid. The production of citric acid by fermentation is influenced by several factors including the type of media and used microorganisms. Fermentation to produce citric acid can be done by using mold as well as yeast. In this study, the mold isolates were Beauveria bassiana and Paelomyces lilacinus, while the yeast isolates were Candida utilis and Candida lessepsii. The fungal fermentations were conducted in two phases of medium, liquid and solid. Three formulas were prepared for liquid fermentation, namely sorghum juice only, sorghum juice supplemented with NH4NO3 and micronutrients, and sorghum juice supplemented with asparagine and micronutrients. Two formulas were prepared for solid fermentation, sulfuric acid hydrolyzed sorghum bagasse and non-hydrolyzed sorghum bagasse. The results showed that citric acid yield in solid fermentation is lower than liquid fermentation. For all formulas, the citric acid formation through liquid fermentation was higher in yeast than in molds. On the other hand, for solid fermentation, citric acid production was higher in hydrolyzed media than non-hydrolyzed media, except for yeast Candida lessepsii.
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